JPS6120661Y2 - - Google Patents

Info

Publication number

JPS6120661Y2

JPS6120661Y2 JP731180U JP731180U JPS6120661Y2 JP S6120661 Y2 JPS6120661 Y2 JP S6120661Y2 JP 731180 U JP731180 U JP 731180U JP 731180 U JP731180 U JP 731180U JP S6120661 Y2 JPS6120661 Y2 JP S6120661Y2

Authority

JP

Japan

Prior art keywords

optical system

thin plate

video disc

optical

holding member

Prior art date

1980-01-24

Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Links

• Espacenet
• Global Dossier
• Discuss

• 230000003287 optical effect Effects 0.000 claims description 34
• 238000001514 detection method Methods 0.000 claims description 3
• 230000005489 elastic deformation Effects 0.000 description 3
• 230000007774 longterm Effects 0.000 description 2
• 238000000034 method Methods 0.000 description 2
• 230000002093 peripheral effect Effects 0.000 description 2
• 238000005299 abrasion Methods 0.000 description 1
• 239000000463 material Substances 0.000 description 1
• 239000007769 metal material Substances 0.000 description 1
• 238000000465 moulding Methods 0.000 description 1
• 230000035699 permeability Effects 0.000 description 1
• 229920003002 synthetic resin Polymers 0.000 description 1
• 239000000057 synthetic resin Substances 0.000 description 1